package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品
     * @param dishDTO
     */
    @Transactional //因为设计两张表，所以需要事务 在我们的启动类有个EnableTransactionManagement注解
    public void saveDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);//属性命名相同，可以直接用copyProperties方法
        //向菜品表插入一条数据
        dishMapper.insert(dish);//需要返回主键值
        //获取insert语句的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!= null && flavors.size() > 0){
            flavors.forEach(flavor -> { //遍历口味列表，给每个口味对象设置菜品id 会增加mysql服务器的压力
                flavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 分页查询菜品
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page =  dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Transactional
    public void deleteDishByIds(List<Long> ids) {
        //判断当前菜品是否能够删除--是否中存在启售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品存在启用的状态，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否被套餐关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds!= null && setmealIds.size() > 0){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
//        for (Long id : ids) {//这里可以优化    一次删除多个id
//            dishMapper.deleteById(id);
//            //删除菜品关联的口味表中的数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //delete from dish where id in (ids) 一句sql

        //根据菜品id集合批量删除菜品表中的菜品数据
        dishMapper.deleteBatch(ids);
        //根据菜品id集合批量删除菜品关联的口味表中的数据
        dishFlavorMapper.deleteBatchByDishIds(ids);

    }

    /**
     * 根据id查询菜品信息及其口味信息
     * @param id
     * @return
     */
    public DishVO getDishByIdWithFlavor(Long id) {
        //根据id查询菜品信息
        Dish dish = dishMapper.getById(id);
        //根据菜品id数据查询口味信息
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
        //将菜品信息和口味信息封装成VO对象
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 更新菜品信息及其口味信息
     * @param dishDTO
     */
    public void updateDishWithFlavor(DishDTO dishDTO) {
        //修改菜品基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.updateById(dish);

        //删除原有菜品口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入新的菜品口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(flavor -> {
                flavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 启用或停用菜品
     * @param id
     * @param status
     */
    public void startOrStopDish(Long id, Integer status) {
        Dish dish = Dish.builder().id(id).status(status).build();
        dishMapper.updateById(dish);
        if(status == StatusConstant.DISABLE) {
            //如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            //select setmeal_id from setmeal_dish where dish_id in (dishIds)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if(setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder().id(setmealId).status(StatusConstant.DISABLE).build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类id查询菜品列表
     * @param categoryId
     * @return
     */
    public List<Dish> listDishByCategoryId(Long categoryId) {
        Dish dish = Dish.builder().categoryId(categoryId).status(StatusConstant.ENABLE).build();
        return dishMapper.list(dish);
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
